Predict Y DC from 128 instead of 0; microscopic improvement.

[narabu] / decoder.shader

diff --git a/decoder.shader b/decoder.shader
index cab6f8cbecbb508421b01740a208b431a8387136..7136e03e5ff0de76095f1fd5974f68fe0bc5a3ba 100644 (file)
--- a/decoder.shader
+++ b/decoder.shader
@@ -224,7 +224,7 @@ void main()
        float q = (coeff_num == 0) ? 1.0 : (quant_matrix[coeff_num] * quant_scalefac / 128.0 / sqrt(2.0));  // FIXME: fold
        q *= (1.0 / 255.0);
        //int w = (coeff_num == 0) ? 32 : int(quant_matrix[coeff_num]);
-       int last_k = 0;
+       int last_k = 128;
 
        pick_timer(start, local_timing[0]);